1. Samuel Xu
2. Some difficulties I faced include trying to figure out if my implementation was actually working as intended.
   I also had some trouble with trying to index nonexistent keys of python dictionaries, which gave keyerrors.
   Debugging wasn't too friendly, and when I mixed the destination and source up in one line of code, it took me a good few hours to find it.
3. I feel like I could implement a better and more efficient way of calculating the minimum distances & paths than what I had. Also, a centralized system would save a lot of calculations. 
4. N/A